Apple today quietly refreshed its MacBook Air line of light laptops, dropping prices by $100 on all four stock models.

Apple today quietly refreshed its MacBook Air line of light laptops, dropping prices by $100 on all four stock models.

The price cut put the cost of the less-expensive 11-in. Air at $899, the first time that Apple has sold a notebook to the public for less than $900. (For about eight months in 2011-2012, Apple sold the plastic-cased MacBook for $899, but only to educational organizations and institutions.)

All four MacBook Air models -- two with an 11-in. screen, two with a 13-in. display -- received the same $100 price cut, which depending on the notebook represented a discount between 7.7% and 10%.

The most-expensive stock MacBook Air, the model with a 13-in. screen and a 256GB SSD (sold-state drive) for storing files and applications, now lists for $1,199.

Other than the price cuts, Apple made few changes. The most noticeable was a bump in processor speeds across the board. While the top-end 13-in. MacBook Air previously packed a 1.3GHz dual-core Intel Core i5 processor, the refreshed model included a 1.4GHz chip.

Since October, the 13-in. MacBook Air's price has fallen between 14% and 17%.

Apple has been caught in the overall personal computer sales slump, as has virtually every OEM (original equipment manufacturer), although sales of Apple's Macs fell for just four quarters before again climbing. The global PC business has shrunk eight quarters, and there's no sign that things will turn around anytime soon.

But while Apple doesn't face the strongest headwinds to sales, it still sails in them: It was concerned enough about those headwinds to cut prices, a move that five years ago would have been inconceivable to outside observers.

The cuts narrow the gap between the 11-in. MacBook Air and an iPad Air with 128GB of storage -- the amount standard for the least-expensive Air -- to just $100, which will likely spark renewed talk of the iPad cannibalizing Apple's notebook sales.

The low-end 11-in. MacBook Air, which boasts an SSD of 128GB, also is now priced the same as a Microsoft Surface 2 Pro with half that storage space and without a keyboard. With a keyboard, say the Type Cover 2, and a bump to 128GB, a Surface 2 Pro costs $1,128.99, more than enough to purchase an 11-in. MacBook Pro with 256GB of storage, or almost enough to buy Apple's top model, the 13-in. 256GB MacBook Air.

The re-priced MacBook Air went on sale today on Apple's online store, throughout its retail chain, and at some resellers. As of mid-day, Apple's online store claimed orders shipped within 24 hours.

With today's minor component changes, rumors of a Retina-equipped Air will undoubtedly continue to circulate. Those reports, all based on anonymous tipsters or sell-side Wall Street analysts' forecasts, have claimed that later this year Apple will consolidate the Air line by offering a 12-in. display with the kind of high-resolution screen now equipping the MacBook Pro models.

Apple cut the price of the low-end 11-in. MacBook Air by 10%, marking the first time it's sold an under-$900 notebook to the public.